It is possible that Mary's maiden name was McConnaughey, based upon the will of her father dated 1/27/1785, in Rowan County, NC, citing his daughter, Mary Kerr.

Mary left a will dated 28 July 1801, probated 1805. She named sons Joseph and Samuel and mentioned brother Arcibald Hamilton in South Carolina. An Archibald Hamilton was administrator of the estate of James Kerr in Augusta County, Va in 1770. John Kerr's land is mentioned.